1. Interventions on electrical distribution and racks’ infrastructure still to be done during LS1 and their impact W.Iwanski

2. Outline Modifications of switchboards EXD16/15X and EXD26/15X New UPS in US15 New switchboards EOD2’/15, ESD2’/15 and EOD5’/15A New switchboard EOD8/15A Modifications of repartition boxes in 19 TDAQ ROS racks in USA15 Refurbishment of cooling turbines in all electronic racks in USA15, US15 and UX15 06/11/2013W.iwanski PH/ESE-BE2

3. Modifications of switchboards EXD16/15X and EXD26/15X Goal: to integrate newly added breakers with our monitoring system – Due to lack of space inside those switchboards, one has to move an interlock module outside Impact: Stop of supply for racks on HOA and HOC for 1 day (November 2013) 06/11/2013W.iwanski PH/ESE-BE3

4. New UPS in US15 Goal: to provide smooth supply for electronic racks fed from Normal network in US15 L2 – Up to 10 min of autonomy, no Diesel back-up Impact: Stop of supply for racks fed from Normal network in US15 during 5 days (9-13 December 2013) 06/11/2013W.iwanski PH/ESE-BE4

5. New switchboards EOD2’/15, ESD2’/15 and EOD5’/15A Goal: to provide new type of control over powering outputs – Motorised breakers which keep failing to turn ON when driven from DCS will be replaced by a breaker_+_contactor combo in new switchboards Impact: Stop of supply for all equipment fed from UPS and Diesel switchboards EOD2/15, ESD2/15 and EOD5/15A for ~ 4 weeks (> March 2014) – EOD2/15: ID heaters, Muons, DCS station, Pixel-DCS, SCT- DCS – ESD2/15: Sniffers, DSS station – EOD5/15A: Muons, Larg cooling station, ID heaters, ID evaporative cooling 06/11/2013W.iwanski PH/ESE-BE5

6. New switchboard EOD8/15A Goal: to provide UPS power for new installations in USA15 Impact: Stop of systems running on temporary supply when connecting them to this new switchboard (> March 2014) – IBL cooling, new racks, Tile cooling station, Larg cooling station (moved from EOD5/15A), Turbo pump.. 06/11/2013W.iwanski PH/ESE-BE6

7. Modifications of repartition boxes in 19 TDAQ ROS racks in USA15 Goal: to reduce inrush current when powering racks ON Impact: Stop of supply in each concerned rack for 1 day (> March 2014) 06/11/2013W.iwanski PH/ESE-BE7

8. Refurbishment of cooling turbines in all electronic racks in UX15, USA15 and US15 (1) Goal: preventive change of motor+fan modules inside turbines due to projected end-of-life of bearings Impact in UX15: Stop of supply in each switchboard supplying a group of racks for ~ 1 day – HOA (5 turbines): 1 day – HOC (5 turbines): 1 day 06/11/2013W.iwanski PH/ESE-BE8

9. Refurbishment of cooling turbines in all electronic racks in USA15, US15 and UX15 (2) Impact in UX15 (cont’d) – HS USA side (23 turbines): 5 days Ground floor: 1 day 1st floor: 1 day 2nd floor: 1 day 4th floor: 1 day 7th & 8th floor: 1 day 06/11/2013W.iwanski PH/ESE-BE9

10. Refurbishment of cooling turbines in all electronic racks in USA15, US15 and UX15 (3) Impact in UX15 (cont’d) – HS US side (17 turbines): 4 days Ground floor: 1 day 1st floor: 1 day 2nd floor: 1 day 7th & 8th floor: 1 day 06/11/2013W.iwanski PH/ESE-BE10

11. Refurbishment of cooling turbines in all electronic racks in USA15, US15 and UX15 (4) Impact in UX15 (cont’d) – BWA (16 turbines): 3 days – BWC (16 turbines) : 3 days 06/11/2013W.iwanski PH/ESE-BE11

12. Refurbishment of cooling turbines in all electronic racks in USA15, US15 and UX15 (5) Impact in USA15 L1 (65 turbines), USA15 L2 (70 turbines) and US15 L2 (28 turbines): Stop of supply in each concerned rack for ~ 1 hour 06/11/2013W.iwanski PH/ESE-BE12